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Depends on what your 4x4 shifter says. It's one of these 2.

NP231 - "Command-Trac" part-time only - 2.72:1 ratio low range - shift pattern 2H - 4H - N - 4L - used 87-01

NP242 - "Selec-Trac" part-time OR full-time - 2.72:1 ratio low range - shift pattern 2wd - 4part-time - 4full-time - N - 4LO - used 87-01
 

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all transfer cases CAME with a little red and silver ID tag.. its on the back of the case about an inch an a half in diameter.. it'll tell you the model, the ratio, and and something else but i cant think of it.. but sounds like you've got it figured out though..
 
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